My grandfather has a 5th wheel that he and my grandmother traveled in for years. The 5th wheel is in great condition and has no major problems, Except for one... MOLD! They no longer travel so the RV is mainly used for a room when family comes to visit. Periodically I go to clean the RV to keep everything looking nice for them. I have noticed that there seems to be a dusty like green mold that is all over everything when I go to clean. The only surface it does not seem to be on is anything that is material. So things like carpet, bed linen, ect. do not seem to have this dusty green looking substance on it. I clean and vacuum anyway just to make sure. I have inspected the RV for possible water leaks, cracks in windows, leaks in water lines in cabinets. I find nothing. The RV is parked under a carport for RV's so it does not really get rained on. I know he has tried those bags from Wal-Mart that are supposed to absorb moisture but they do not seem to do much good. I clean the RV every 6 months or so and while the mold is there it does not seem to be very bad. Also, I live in Texas where the humidity in the summer can hard boil an egg so I'm pretty sure that has allot to do with this. Any help or suggestions to prevent the mold would be greatly appreciated.